# Representation Information Representation Information comes in many forms. It is whatever helps in the understandability and use of the data object i.e. the bits. The OAIS Archival Information Package schema attached to a Data Object allows one to attach Structural, Semantic and Other Representation Information. However, as described above, if the Representation applies to every object in the folder then the Representation Information may be attached to the folder, or if not there then one of the higher level folders or containers. There are many types of Representation Information which can be usefully classified as: * Structure Representation Information * The Representation Information that imparts information about the arrangement of and the organization of the parts or elements of the Data Object. * NOTE – For example, Structure Representation Information maps bit streams to common computer types such as characters, numbers, and pixels and aggregations of those types such as character strings and arrays. * Semantic Representation Information * The Representation Information that imparts information about the arrangement of and the organization of the parts or elements of the Data Object. * NOTE – For example, Structure Representation Information maps bit streams to common computer types such as characters, numbers, and pixels and aggregations of those types such as character strings and arrays. * Other Representation Information * A type of Representation Information which cannot easily be classified as Structure Representation Information or Semantic Representation Information. It is a type of Information Object. * NOTE – For example, software, algorithms, encryption, written instructions and many other things may be needed to understand the Content Data Object in ways exemplified by the Preservation Objectives, all of which therefore would be, by definition, Representation Information, yet would not obviously be either Structure Representation Information or Semantic Representation. Information defining how the Structure Representation Information and the Semantic Representation Information relate to each other, or software needed to process a database file would also be regarded as Other Representation Information. [Adding Representation Information](/labdrive/data-curation-and-preservation-1/preservation-activities/adding-representation-information.md) describes the various types opf Representation Information in more detail. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.libnova.com/labdrive/data-curation-and-preservation-1/how-to-deal-with-additional-information/representation-information.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.